JP2016129612A - rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rice cooker capable of suppressing boiling-over of sticky matter, etc.SOLUTION: The rice cooker includes: a cooker body including an inner pot accommodation part accommodating an inner pot; and a lid body including an outer lid and an inner lid attached on a lower face side of the outer lid. The inner pot includes: a bottom part; and a cylinder part arranged in an upper part of the bottom part and extended up to an opening edge of the inner pot. The cylinder part includes: an accommodated cylinder part accommodated in the inner pot accommodation part; a protruded cylinder part protruded from the inner pot accommodation part and extended up to the opening edge; and a flange part protruded in an outer side from an outer peripheral face of the protruded cylinder part and contacting an upper edge of the inner pot accommodation part. The rice cooker further includes: a lid heater heating the inner pot; a flange upper heater heating a side face of the protruded cylinder part in an upper part than the flange part; a body heater heating a side face of the accommodated cylinder part in a lower part than the flange part; a bottom heater heating a bottom part of the inner pot; and control means controlling electrification to the lid heater, flange upper heater, body heater, and bottom heater. The control means stops electrification to the flange upper heater at least during a period reaching boiling in a rice cooking process.SELECTED DRAWING: Figure 4

Description

  This invention relates to a rice cooker.

  2. Description of the Related Art Conventionally, rice cookers having a structure that prevents rice balls from spilling outside the lid are known (see, for example, Patent Document 1).

JP 2001-309851 A

  However, in the conventional rice cooker, the structure for preventing the spilling of the rice balls is complicated and has become larger. Therefore, it is difficult to clean the structure that prevents the spilling of rice balls, and the rice cooker has become larger.

  The present invention has been made against the background of the above problems, and an object of the present invention is to provide a rice cooker that can suppress the spilling of rice balls and the like with a simple configuration.

  The rice cooker according to the present invention includes an inner pot whose upper surface is open, a rice cooker body having an inner pot accommodating portion that accommodates the inner pot, an outer lid that covers the upper portion of the rice cooker body, and a lower surface side of the outer lid. A cover body having a mounted inner lid, the inner hook having a bottom portion and a cylindrical portion extending to the opening end of the inner hook above the bottom portion, and the cylindrical portion is accommodated in the inner hook accommodating portion. A cylindrical portion to be received, a protruding cylindrical portion that protrudes upward from the inner hook accommodating portion and extends to the opening end portion, and a flange portion that protrudes outward from the outer peripheral surface of the protruding cylindrical portion and contacts the upper end of the inner hook accommodating portion. A lid heater that heats the inner lid, an upper heater that heats the side surface of the projecting cylinder portion above the collar portion, a trunk heater that heats the side surface of the housing cylinder portion below the collar portion, A bottom heater for heating the bottom, and a control means for controlling energization to the lid heater, the upper heater, the trunk heater and the bottom heater Stage, in the period leading up to boiling at least cooking process, and controls so as to stop the power supply to the flange on the heater.

  According to the present invention, it is possible to easily suppress spillage such as a rice ball.

It is the figure which described roughly the cross section of the rice cooker which concerns on Embodiment 1 of this invention. It is a perspective view of the inner hook described in FIG. It is a block diagram of the rice cooker which concerns on Embodiment 1 of this invention. It is a figure explaining the operation | movement at the time of rice cooking of the rice cooker which concerns on Embodiment 1 of this invention. It is a figure explaining operation | movement at the time of rice cooking (when there is little rice cooking amount) of the rice cooker which concerns on Embodiment 2 of this invention. It is a figure explaining operation | movement at the time of rice cooking (when there is much rice cooking amount) of the rice cooker which concerns on Embodiment 2 of this invention. It is a figure explaining operation | movement at the time of rice cooking (when there are many amounts of rice cooking) of the rice cooker which concerns on Embodiment 3 of this invention. It is a figure explaining operation | movement at the time of the heat retention of the rice cooker which concerns on Embodiment 4 of this invention. It is a figure explaining the operation | movement at the time of the heat retention of the rice cooker which concerns on the modification of Embodiment 4 of this invention. It is a figure explaining operation | movement at the time of the heat retention (when there is little amount of cooked rice) of the rice cooker which concerns on Embodiment 5 of this invention. It is a figure explaining operation | movement at the time of the heat retention of the rice cooker which concerns on Embodiment 5 of this invention (when there are many amounts of cooked rice).

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof is omitted or simplified as appropriate. In addition, the shape, size, arrangement, and the like of the configuration described in each drawing can be changed as appropriate within the scope of the present invention.

Embodiment 1 FIG.
[rice cooker]
FIG. 1 is a diagram schematically illustrating a cross section of an example of a rice cooker according to Embodiment 1 of the present invention, and FIG. 2 is a diagram of the inner pot illustrated in FIG. FIG. 3 is a block diagram of the rice cooker. As shown in FIG. 1, a rice cooker 100 according to this embodiment includes a rice cooker body 1 having an inner pot accommodating portion 1a, an inner pot 5 that is detachably installed in the inner pot accommodating portion 1a, and a rice cooker. And a lid 2 that covers the upper portion of the main body 1. The lid 2 is attached to the rice cooker body 1 so as to be freely opened and closed. The user opens the lid body 2 and, for example, installs the inner hook 5 in the inner hook accommodating portion 1a or takes out the inner hook 5 from the inner hook accommodating portion 1a. Further, for example, the user closes the lid body 2 and cooks an object to be cooked such as rice prepared in the inner pot 5.

[Lid]
The lid 2 includes an outer lid 2a and an inner lid 2b. The outer lid 2a covers the top of the rice cooker body 1. The outer lid 2a is attached to the rice cooker body 1 so as to be openable and closable behind the rice cooker body 1 by a coupling mechanism (not shown) such as a hinge. An inner lid 2b is detachably mounted on the lower surface side of the outer lid 2a. The inner lid 2b covers the opening of the inner hook 5, and a ring-shaped seal member 12 is disposed on the lower surface side of the inner lid 2b. When the lid 2 is closed, the seal member 12 comes into contact with the opening end 5d of the inner hook 5 to seal between the opening end 5d of the inner hook 5 and the inner lid 2b. The seal member 12 is formed of an elastic material such as silicon resin, for example. In addition, a steam hole 2b1 is formed in the inner lid 2b. An opening / closing valve 11 is provided in the steam hole 2b1 of the inner lid 2b. The on-off valve 11 is moved up and down by the pressure inside the inner hook 5. A part of the steam generated during rice cooking or the like passes through the steam hole 2b1 and is guided to the cartridge 20 installed above the inner lid 2b. The cartridge 20 is detachably mounted on the outer lid 2a above the inner lid 2b. The cartridge 20 separates the steam containing the rice cake component during rice cooking into the rice cake ingredient and the steam, and guides the separated steam to the outside of the rice cooker 100. In other words, the steam including the tow component that has passed through the steam hole 2b1 of the inner lid 2b flows into the cartridge 20 from the inflow portion 20a of the cartridge 20, and is separated into the towed component and the steam in the cartridge 20. Steam is discharged from the steam discharge unit 20b.

[Rice cooker body]
The rice cooker main body 1 has an inner pot accommodating portion 1a whose upper portion is opened. The upper end of the inner hook accommodating portion 1 a constitutes a hook support portion 1 a 1 that supports the lower side of the hook portion 50 of the inner hook 5. A ring-shaped inner hook seal member 1a2 that is in contact with the lower side of the hook portion 50 of the inner hook 5 is disposed on the hook support portion 1a1. The inner hook seal member 1a2 seals between the lower side of the flange portion 50 and the flange support portion 1a1, and is formed of an elastic material such as silicon resin, for example. When the inner pot 5 is installed in the rice cooker main body 1, the space between the outside of the inner pot 5 and the inner side of the inner pot accommodating portion 1 a is sealed below the flange portion 50 of the inner pot 5.

  The rice cooker body 1 includes an operation unit 3, a display unit 4, a heating unit 7, a temperature sensor 8, and a control unit 10. The operation unit 3 and the display unit 4 are provided, for example, in front of the rice cooker body 1. The operation unit 3 gives instructions to the rice cooker 100, and is configured by, for example, a touch sensor. The user can operate the operation unit 3 to give instructions such as selection of a cooking menu, setting of cooking time, or adjustment of heating power. The display part 4 displays the state etc. of the rice cooker 100, for example, is comprised by the liquid crystal panel etc. The operation unit 3 and the display unit 4 may be configured by a touch panel in which these are integrally formed. The temperature sensor 8 detects the temperature in the vicinity of the center of the bottom 5a of the inner hook 5, and is composed of, for example, a thermistor. The control means 10 controls the whole rice cooker 100 as will be described later, and includes, for example, a CPU or a dedicated IC.

  The heating means 7 heats the inner pot 5 and operates based on an instruction from the control means 10. The heating means 7 includes, for example, a first bottom heater 7a, a second bottom heater 7b, and a body heater 7c. The first bottom heater 7a and the second bottom heater 7b are collectively referred to as a bottom heater. The first bottom heater 7 a heats the bottom 5 a of the inner hook 5. The second bottom heater 7 b heats the corner portion 5 b of the inner hook 5. In the example of this embodiment, the first bottom heater 7a and the second bottom heater 7b are constituted by induction coils, but the first bottom heater 7a and the second bottom heater 7b are electrically connected. You may be comprised with the heat ray | wire etc. The trunk heater 7c heats the cylindrical portion 5c of the inner hook 5, and is constituted by, for example, a cord heater.

  As shown in FIG. 3, the control means 10 selects a cooking menu, sets cooking time, or adjusts the heating power based on the instruction information input from the operation unit 3, and displays the instruction information on the display unit 4. Let Further, based on the temperature detection information detected by the temperature sensor 8, to the bottom heater (first bottom heater 7a, second bottom heater 7b), the trunk heater 7c, the upper heater 7d and the lid heater 7e as the heating means 7. Control energization. The energization power to the bottom heater, the trunk heater 7c, the upper heater 7d and the lid heater 7e is controlled as an average power by turning on / off the energization of each heater and adjusting the energization ratio.

[Inner pot]
As shown in FIG. 2, the inner hook 5 has a bottom portion 5a, a cylindrical portion 5c extending to the opening end portion 5d above the bottom portion 5a, and a corner portion 5b between the bottom portion 5a and the cylindrical portion 5c. It is a bottom cylindrical cooking container. The inner hook 5 is formed, for example, by cutting out a baked carbon material. The inner hook 5 may be formed of, for example, a metal such as iron, aluminum, or copper, or an alloy containing these, and in that case, is formed through processes such as casting and cutting.

  The cylinder part 5c of the inner pot 5 of the rice cooker 100 of this embodiment includes a first cylinder part 5c1 and a second cylinder part 5c2 that extends to the opening end part 5d above the first cylinder part 5c1. The 1st cylinder part 5c1 has an internal peripheral surface formed in the substantially linear shape along the up-down direction. The second cylinder portion 5c2 has an inner peripheral surface gradually narrowed in the radial direction while going from the lower side toward the upper opening end portion 5d. Further, the outer peripheral surfaces of the first cylindrical portion 5c1 and the second cylindrical portion 5c2 are formed in substantially the same shape as the respective inner peripheral surfaces. That is, the outer peripheral surface of the first cylinder part 5c1 is formed in a substantially linear shape along the vertical direction, and the outer peripheral surface of the second cylinder part 5c2 is directed from the lower side toward the upper opening end part 5d. It is gradually narrowed in the direction. That is, the inner hook 5 has a substantially bowl-shaped outer shape whose upper end portion is formed smaller than the maximum diameter of the inner hook 5. Further, a flange 50 is provided on the outer peripheral surface of the inner hook 5. The collar part 50 protrudes outward from the outer peripheral surface of the second cylinder part 5c2.

[Installation of the inner pot on the rice cooker body]
As shown in FIG. 1, when the inner pot 5 is installed in the rice cooker body 1, the lower portion of the hook portion 50 of the inner pot 5 comes into contact with the hook support portion 1 a 1 at the upper end of the inner pot receiving portion 1 a, 5 is supported by the heel support 1a1. The cylinder part 5c below the lower part of the flange part 50 constitutes a receiving cylinder part 5e1 (see FIG. 2) accommodated in the inner hook accommodating part 1a, and the cylinder part 5c above the lower part of the flange part 50 is A protruding cylinder portion 5e2 that protrudes upward from the inner hook accommodating portion 1a and extends to the opening end portion 5d of the inner hook 5 is configured. The accommodated cylinder portion 5e1 includes the first cylinder portion 5c1, and a water level display portion 54 for displaying the water level is disposed on the inner peripheral portion of the accommodated cylinder portion 5e1 as shown in FIG. Has been. The protruding cylinder portion 5e2 includes the second cylinder portion 5c2, and the inner peripheral surface of the protruding cylinder portion 5e2 is gradually narrowed in the radial direction from the lower side toward the upper opening end portion 5d. Yes.

  As shown in FIG. 1, the rice cooker main body 1 according to this embodiment has a portion having a height substantially equal to the height of the upper end of the inner pot accommodating portion 1 a on the side. Is installed in the inner pot accommodating portion 1a, the portions along the circumferential direction of the flange portion 50 and the protruding cylindrical portion 5e2 protrude upward from the rice cooker body 1. In addition, the rice cooker main body 1 is placed on the entire circumference in the circumferential direction so that the bowl 50 and the protruding cylinder 5e2 protrude from the upper side of the rice cooker main body 1 over the entire circumference in the circumferential direction of the rice cooker main body 1. It may be formed so as to have a height substantially equal to the height of the upper end of the inner hook accommodating portion 1a. In this embodiment, since at least the portions along the circumferential direction of the flange portion 50 and the protruding cylinder portion 5e2 protrude upward from the rice cooker body 1, the user holds the flange portion 50 and moves the inner pot 5 Can be easily taken out.

  As shown in FIG. 1, when the lid body 2 is closed, a heat radiation space 13 is formed between the inner peripheral surface of the outer lid 2a and the outer peripheral surface of the protruding cylindrical portion 5e2. The heat radiation space 13 is a gap formed between the inner peripheral surface of the outer lid 2a and the outer peripheral surface of the protruding cylindrical portion 5e2. The rice cooker 100 has a ventilation portion 14 that allows the heat radiation space 13 to ventilate the outside of the rice cooker 100. The ventilation part 14 is the clearance gap formed between the rice cooker main body 1 and the outer cover 2a, for example. The ventilation portion 14 may have a configuration such as a hole formed in the rice cooker main body 1 or the lid body 2 for ventilating the heat radiation space 13 from the outside of the rice cooker 100.

Next, the operation will be described.
FIG. 4 is a diagram for explaining the operation during rice cooking.
The inner pot 5 containing rice and water is accommodated in the inner pot accommodating portion 1a, the lid 2 is closed, and the operation of starting rice cooking is performed from the operation portion 3. Then, the control means 10 energizes the bottom heaters 7a and 7b with, for example, the maximum power (energization ratio 100%, average power 1240W) to heat the water and rice in the inner pot 5. Here, the electric power and energization amount of the bottom heaters 7a and 7b represent the total value of the electric power and energization amount of the first bottom heater 7a and the second bottom heater 7b. In FIG. 4, the vertical axis shows the temperature of water and rice in the inner pot 5 as the rice temperature. The temperature of the rice is detected by the temperature sensor 8 via the bottom 5a of the inner pot 5. When the rice temperature rises to a temperature of around 60 degrees, the control means 10 reduces the energization ratio to the bottom heaters 7a and 7b (for example, about 50%, average power of about 620 W), and the rice temperature is set to around 60 degrees for a predetermined time ( (For example, about 15 minutes). During this water absorption period, water is absorbed into the rice.

  After the water absorption period, the control means 10 controls the energization so that the energization amount to the bottom heaters 7a and 7b becomes the maximum again (the energization ratio is 100% and the average power is about 1240W). The amount of cooked rice is determined from the temperature rise rate at this time. That is, if the temperature increase rate is small, it is determined that the amount of cooked rice is large. This rice cooking amount determination information is stored in a storage unit (not shown) in the control means 10. The control means 10 energizes only the bottom heater until the rice temperature reaches 100 degrees and reaches boiling (starts boiling). Steam containing rice balls is generated before the rice temperature reaches 100 degrees. During this period, the control means 10 stops energization to the upper heater 7d.

  When the rice temperature reaches 100 degrees, the control means 10 reduces the energization amount of the bottom heaters 7a and 7b from the maximum value over the generation period, the dry-up period, and the uneven period (for example, an energization ratio of 80%, Average power about 1040W). Further, the control means 10 applies a predetermined energization amount to the body heater 7c (for example, an energization ratio of 50% and an average power of about 20 W) and a predetermined energization amount to the upper heater 7d (for example, an energization ratio of 50% and an average power). 15W), the lid heater 7e is controlled to be energized with a predetermined energization amount (for example, an energization ratio of 80% and an average power of about 32W).

  The cylinder part 5c of the inner hook 5 includes a receiving cylinder part 5e1 accommodated in the inner pot accommodating part 1a and a protruding cylinder part 5e2 protruding upward from the inner pot accommodating part 1a. A heat radiating space 13 for radiating heat is formed outside the protruding cylindrical portion 5e2 projecting upward from the inner pot accommodating portion 1a, and steam containing rice cake before the rice temperature reaches 100 degrees. Since the control means 10 stops energization to the upper heater 7d during the generation period, the outer peripheral surface of the protruding cylindrical portion 5e2 is cooled with air. Therefore, since the foam and the steam which were springed up during the cooking with the rice cooker 100 are cooled by the protruding cylinder part 5e2, the risk of spilling is suppressed. Preferably, the heat radiation space 13 is configured to ventilate the outside of the rice cooker 100 through the ventilation portion 14, and can efficiently dissipate heat in the protruding cylinder portion 5e2.

  Furthermore, the inner peripheral surface of the protruding cylindrical portion 5e2 is gradually narrowed in the radial direction from the lower side toward the upper opening end portion 5d. Therefore, in this embodiment, steam generated during cooking or the like is brought into contact with the inner peripheral surface of the protruding cylindrical portion 5e2 to condense and is returned, for example, dropwise to the inside of the inner pot 5. Furthermore, the foam that has risen during cooking and has propagated along the inner peripheral surface of the inner pot 5 falls by its own weight on the inner peripheral surface of the protruding cylindrical portion 5e2. As a result, in this embodiment, the risk of spillage is suppressed. Furthermore, in this embodiment, since bubbles and steam that have risen during cooking are suppressed from being discharged to the outside of the inner pot 5, cooking is performed by confining the taste of a cooked item such as rice. It can be performed.

  Moreover, in this embodiment, the water level display part 54 which displays a water level is arrange | positioned by the inner peripheral surface side of the to-be-contained cylinder part 5e1 below the protrusion cylinder part 5e2, and a to-be-cooked object is a protrusion cylinder part. It is accommodated in the accommodated cylinder portion 5e1 below 5e2. And the heating means 7 which heats the to-be-accepted cylinder part 5e1 is arrange | positioned outside the to-be-accepted cylinder part 5e1. For this reason, in this embodiment, the to-be-heated material prepared for the inner pot 5 can be efficiently heated.

  Furthermore, in this embodiment, the lower part of the hook part 50 of the inner pot 5 is in contact with the hook support part 1a1 at the upper end of the inner pot accommodating part 1a over the entire circumference, so that heat during cooking is generated. , And is confined below the flange 50. Therefore, in this embodiment, the cooking object such as rice prepared in the inner pot 5 can be efficiently heated. Furthermore, in this embodiment, since heat during cooking is confined below the flange 50, the protruding cylinder 5e2 is efficiently cooled in the heat radiation space 13 above the flange 50. be able to.

  Further, since the risk of spillage can be suppressed, the configuration of the cartridge 20 can be simplified and the cartridge 20 can be downsized. In this embodiment, since the configuration of the cartridge 20 is simplified, the cleaning of the cartridge 20 is easy and the cartridge 20 is downsized, so that the rice cooker 100 can be downsized. Can do. As described above, in this embodiment, it is possible to suppress spillage such as rice balls during cooking with a simple configuration. Note that the cartridge 20 can be omitted when the structure of the inner hook 5 sufficiently suppresses the risk of spillage.

  As described above, according to the rice cooker of the first embodiment, the inner pot whose upper surface is opened, the rice cooker main body having the inner pot accommodating portion for accommodating the inner pot, the outer lid that covers the upper portion of the rice cooker main body, and A lid body having an inner lid mounted on the lower surface side of the outer lid, the inner hook has a bottom portion, and a cylindrical portion extending to the opening end of the inner hook above the bottom portion, A cylindrical portion to be accommodated in the inner hook accommodating portion, a protruding cylindrical portion projecting upward from the inner hook accommodating portion and extending to the opening end, and projecting outward from the outer peripheral surface of the protruding cylindrical portion, A lid heater that has a flange portion that comes into contact with the upper end and that heats the inner lid, a heater that heats the side surface of the protruding cylinder portion above the flange portion, and a side surface of the housing cylinder portion that is below the flange portion Control that controls energization to the trunk heater, the bottom heater that heats the bottom of the inner hook, the lid heater, the upper heater, the trunk heater, and the bottom heater Since the control means controls to stop energization to the upper heater at least during the period of boiling in the rice cooking process, the protruding cylinder part is cooled and easily suppresses spillage of rice cake etc. can do.

Embodiment 2. FIG.
In the first embodiment, it has been shown that the control means 10 performs control so as to stop energization of the upper heater 7d during a period in which steam including rice cracks is generated before the rice temperature reaches 100 degrees. In the second embodiment, control of the energization amount to each heater after the rice temperature reaches 100 degrees will be described.
FIG. 5 is a diagram for explaining the operation of the rice cooker according to Embodiment 2 when cooking rice (when the amount of cooked rice is small). FIG. 6 is a diagram for explaining the operation of the rice cooker according to Embodiment 2 at the time of rice cooking (when the amount of cooked rice is large). The energization control for each heater up to the water absorption step and boiling is the same as in the first embodiment.

  After the rice temperature reaches 100 degrees, the control means 10 energizes the upper heater 7d with a predetermined energization amount (for example, an energization ratio of 50% and an average power of about 15 W). Thereby, generation | occurrence | production of the water droplet condensed on the inner wall of the protrusion cylinder part 5e2 is suppressed, and the swell of the rice near the inner wall of the protrusion cylinder part 5e2 at the time of rice cooking completion can be prevented.

  Further, the control means 10 energizes the lid heater 7e with a predetermined energization amount (for example, an energization ratio of 80% and an average power of about 32 W). Thereby, generation | occurrence | production of the water droplet condensed on the lower surface of the inner cover 2b is suppressed, and it is possible to prevent the rice from being burnt when the rice cooking is completed.

  Furthermore, based on the information on the amount of rice cooked stored in a storage unit (not shown) in the control means 10, the amount of power applied to the drum heater 7c when the amount of rice cooked is large, to the drum heater 7c when the amount of rice cooked is small. The energization to the body heater 7c is controlled to be larger than the energization amount. Thereby, when there is much rice cooking amount, since the quantity heated with the trunk | drum heater 7c increases, rice can be cooked plumply and deliciously.

  Thus, according to the rice cooker of Embodiment 2, while the control means energizes the rice cake heater and the lid heater by a predetermined amount during the period after boiling in the rice cooking process, the amount of rice cooking is large. Since the energization to the body heater is controlled so that the energization amount to the body heater is larger than the energization amount to the body heater when the amount of cooking rice is small, the rice can be cooked plumply and deliciously without burning. it can.

Embodiment 3 FIG.
In the third embodiment, after the rice temperature reaches 100 degrees, the control means 10 energizes the upper heater 7d by a predetermined amount, and the energization amount to the lid heater 7e when the rice cooking amount is large is small. The energization to the lid heater 7e is controlled to be smaller than the energization amount to the lid heater 7e at that time.
FIG. 7 is a diagram for explaining the operation of the rice cooker according to Embodiment 3 when cooking rice (when the amount of cooked rice is large).

  When the amount of cooked rice is large, the distance between the lid heater 7e and the top surface of the cooked rice in the inner pot 5 is small, so that the top surface of the cooked rice is easily dried by the lid heater 7e. Since the energization to the lid heater 7e is controlled so that the energization amount to the lid heater 7e when the rice cooking amount is large is smaller than the energization amount to the lid heater 7e when the rice cooking amount is small, Drying of the upper surface can be suppressed. Moreover, generation | occurrence | production of the water droplet condensed on the lower surface of the inner cover 2b is suppressed. In addition, since a predetermined amount of electricity is supplied to the rice bran heater 7d, generation of water droplets condensed on the inner wall of the protruding cylinder part 5e2 is suppressed, and rice burn near the inner wall of the protruding cylinder part 5e2 when cooking rice is completed can be prevented. .

  Thus, according to the rice cooker of Embodiment 3, in the period after boiling in the rice cooking process, the energizing amount of the lid heater when the amount of rice cooking is large and the energizing heater is energized by a predetermined amount. Since the energization to the lid heater is controlled so that it is smaller than the energization amount to the lid heater when the amount of cooked rice is small, drying of the top surface of the cooked rice can be suppressed at the completion of rice cooking, and the rice is deliciously plump and delicious Can be cooked.

Embodiment 4 FIG.
Embodiment 1 to Embodiment 3 showed energization control to each heater in a rice cooking process. In the fourth embodiment, energization control to each heater in the heat retention process after the rice cooking process will be described.
FIG. 8 is a diagram for explaining the operation during heat retention of the rice cooker according to the fourth embodiment.

  As shown in FIG. 8, the control means 10 stops energization to the trunk heater 7c during the temperature decrease period in the heat retaining step. Furthermore, the control means 10 stops energization to the bottom heaters 7a and 7b and the upper heater 7d. On the other hand, the lid heater 7e is energized with a predetermined energization amount (for example, an energization ratio of about 50% and an average power of about 20 W). As a result, the temperature of the cooked rice is lowered from 100 ° C. to a temperature of about 65 ° C. to 70 ° C. (temperature reduction period), and thereafter, the energization amount of each heater is controlled so as to maintain this heat insulation for a predetermined period (heat insulation period). . Here, when the temperature is maintained at 70 ° C. or higher for a long time, the rice is dried or yellowed. In addition, when the temperature is 60 ° C. or less, rot occurs. The temperature rise of the cooked rice is mainly due to heating by the drum heater 7c, and the temperature drop period is shortened by stopping the energization of the drum heater 7c during the temperature drop period. Therefore, the time of 70 degrees or more in which yellowing occurs is shortened, and yellowing of cooked rice in the heat retaining process is suppressed.

  FIG. 9 is a diagram for explaining the operation during heat retention of the rice cooker according to the modification of the fourth embodiment. The difference from the operation shown in FIG. 8 is that the control means 10 energizes the upper heater 7d in addition to the lid heater 7e during the temperature decrease period in the heat retention process. By energizing the upper heater 7d, the protruding cylinder part 5e2 is heated even during the temperature reduction period, so that the generation of water droplets that are condensed on the inner wall of the protruding cylinder part 5e2 is suppressed, and the protruding cylinder part 5e2 at the end of the temperature reduction period. Can prevent the rice from spreading near the inner wall.

  Thus, according to the rice cooker of Embodiment 4, since the energization to the body heater is stopped in the temperature decrease period in the heat retention process, the temperature decrease period is shortened and the yellowing of the cooked rice in the heat retention process is suppressed. The rice can be kept warm in a delicious state.

Embodiment 5 FIG.
In the fourth embodiment, the energization control to each heater during the temperature decrease period of the heat retention process has been described. In the fifth embodiment, energization control to each heater in the heat retention period after the temperature decrease period will be described.
FIG. 10 is a diagram for explaining the operation of the rice cooker according to Embodiment 5 when keeping warm (when the amount of cooked rice is small). FIG. 11 is a diagram for explaining the operation of the rice cooker according to Embodiment 5 when keeping warm (when the amount of cooked rice is large).

  In FIG. 10, the control means 10 repeats energization with a predetermined energization amount and deenergization to the bottom heaters 7a and 7b, the trunk heater 7c and the upper heater 7d, respectively, during the heat insulation period, thereby controlling the temperature of the cooked rice. Keep constant. The controller 10 energizes the lid heater 7e with the same energization amount (for example, energization ratio of about 50% and average power of about 20 W) during the temperature retention period. Further, the control means 10 energizes the upper heater 7d with a predetermined energization amount (for example, an energization ratio of about 30% and an average power of about 9 W) during the heat insulation period.

  On the other hand, as shown in FIG. 11, when the amount of cooked rice is large, the control means 10 is configured so that the energization amount to the lid heater 7e is smaller than the energization amount when the amount of cooked rice is small. The energization control is performed on the lid heater 7e. Further, when the amount of cooked rice is large, the control means 10 applies the energizing amount to the upper heater 7d so that the energization amount to the upper heater 7d is larger than the energized amount when the amount of cooked rice is small. On the other hand, energization control is performed. The control means 10 applies power to the bottom heaters 7a and 7b and the body heater 7c so that the energization amount to the bottom heaters 7a and 7b and the body heater 7c is the same when the amount of cooked rice is large and small. In contrast, the energization is controlled so that the temperature of the cooked rice does not exceed 70 degrees.

  When the amount of cooked rice is large, the distance between the lid heater 7e and the top surface of the cooked rice in the inner pot 5 is small, so that the top surface of the cooked rice is easily dried by the lid heater 7e. The energization of the lid heater 7e is controlled so that the energization amount to the lid heater 7e when the amount of cooked rice is large is smaller than the energization amount to the lid heater 7e when the amount of cooked rice is small. Drying can be suppressed. Moreover, generation | occurrence | production of the water droplet condensed on the lower surface of the inner cover 2b is suppressed.

In addition, when the energizing amount of the lid heater 7e is large (when the amount of cooked rice is small), the inner wall of the protruding cylindrical portion 5e2 is heated by the heat generated by the lid heater 7e. The energization amount to the upper heater 7d may be small. In any case, since the inner wall of the protruding cylinder part 5e2 is heated, the generation of water droplets that are condensed on the inner wall of the protruding cylinder part 5e2 is suppressed, and the swell of rice near the inner wall of the protruding cylinder part 5e2 during heat insulation is prevented. be able to.
Note that the lid heater 7e is energized with a predetermined energization amount (for example, an energization ratio of about 50% and an average power of about 20 W) in the heat retention period, as in the temperature decrease period. On the other hand, the control means 10 energizes the upper heater 7d with a predetermined energization amount (for example, an energization ratio of about 30% and an average power of about 9 W).

  As described above, according to the rice cooker of the fifth embodiment, the control means energizes the lid heater with a predetermined amount during the heat retention period in the heat retention step, and energizes the lid heater when the amount of cooked rice is large. Is controlled to be less than the amount of electricity to the lid heater when the amount of cooked rice is small, so the yellowing of the rice in the heat insulation process is suppressed and the rice is kept warm in a delicious state can do.

Embodiment 6 FIG.
Another example of energization control to each heater in the heat retention period after the temperature decrease period will be described.
In the sixth embodiment, a predetermined amount of electricity is supplied to the upper heater 7d and the lid heater 7e, and the amount of electricity supplied to the body heater 7c is adjusted according to the amount of cooked rice.

  By energizing the upper heater 7d and the lid heater 7e with a predetermined amount, the upper surface of the cooked rice in the inner pot 5 can be prevented from drying, and water droplets condensed on the inner wall of the projecting cylindrical portion 5e2 can be prevented. Furthermore, when there is much cooked rice to heat-retain, the heat capacity of the object heated by the trunk heater 7c is large. Therefore, in order to maintain the cooked rice at an appropriate temperature, it is desirable to change the heating amount of the trunk heater 7c according to the heat capacity of the cooked rice. That is, the heating amount of the drum heater 7c is increased when the amount of cooked rice is large, and the heating amount of the drum heater 7c is decreased when the amount of cooked rice is small.

As described above, according to the rice cooker of the sixth embodiment, the control means supplies a predetermined amount of electricity to the upper heater and the lid heater during the heat retention period in the heat retention process, and to the body heater when the amount of cooked rice is large. Since the energization to the drum heater is controlled to be larger than the energization amount to the drum heater when the amount of cooked rice is small, the heat insulation temperature is appropriately maintained according to the amount of cooked rice. can do.

  DESCRIPTION OF SYMBOLS 1 Rice cooker main body, 1a Inner pot accommodating part, 1a1 Rice bran support part, 1a2 Inner pot seal member, 2 Cover body, 2a Outer cover, 2b Inner cover, 2b1 Steam hole, 3 Operation part, 4 Display part, 5 Inner pot, 5a bottom part, 5b corner part, 5c cylinder part, 5c1 first cylinder part, 5c2 second cylinder part, 5d open end part, 5e1 receiving cylinder part, 5e2 protruding cylinder part, 7 heating means, 7a first bottom heater, 7b Second bottom heater, 7c Body heater, 7d Top heater, 7e Cover heater, 8 Temperature sensor, 10 Control means, 11 Open / close valve, 12 Seal member, 13 Heat radiation space, 14 Ventilation part, 20 Cartridge, 20a Inflow part , 20b Steam discharge part, 50 collar part, 54 water level display part, 100 rice cooker.

Claims (6)

An inner pot with an open top;
A rice cooker body having an inner pot accommodating portion for accommodating the inner pot;
An outer lid that covers the upper portion of the rice cooker body and a lid body that has an inner lid mounted on the lower surface side of the outer lid,
The inner hook has a bottom portion, and a cylindrical portion extending to the opening end of the inner hook above the bottom portion,
The cylindrical portion includes a receiving cylindrical portion that is accommodated in the inner hook accommodating portion, a protruding cylindrical portion that protrudes upward from the inner hook accommodating portion and extends to the opening end portion, and an outer side from an outer peripheral surface of the protruding cylindrical portion. And has a flange that contacts the upper end of the inner hook accommodating portion,
A lid heater for heating the inner lid;
An eaves heater that heats the side surface of the protruding cylinder part above the eaves part;
A body heater that heats the side surface of the housing cylinder below the flange;
A bottom heater for heating the bottom of the inner pot;
Control means for controlling energization to the lid heater, the upper heater, the trunk heater, and the bottom heater,
The said control means is controlled so that the electricity supply to the said top heater is stopped at least in the period which reaches boiling in a rice cooking process.   The control means energizes the upper heater and the lid heater by a predetermined amount during the period after boiling in the rice cooking process, and the amount of electricity applied to the body heater when the amount of rice cooking is large is small. 2. The rice cooker according to claim 1, wherein the energization to the drum heater is controlled to be larger than the energization amount to the drum heater at the time.   In the period after boiling in the rice cooking process, the control means energizes the paddle heater by a predetermined amount, and the lid energizes the energization amount to the lid heater when the rice cooking amount is large. The rice cooker according to claim 1 or 2, wherein the energization to the lid heater is controlled to be smaller than the energization amount to the heater.   The rice cooker according to any one of claims 1 to 3, wherein the control means performs control so as to stop energization of the drum heater during a temperature decrease period in a heat retaining step.   The control means supplies the lid heater with a predetermined amount of electricity during the heat-retention period in the heat-retaining step, and the lid heater when the amount of cooked rice to keep the energization amount to the lid heater when the amount of cooked rice is large is small The rice cooker according to any one of claims 1 to 4, wherein the energization to the lid heater is controlled so as to be smaller than the energization amount.   When the control means supplies a predetermined amount of current to the upper heater and the lid heater during the heat retention period in the heat retention step, and the amount of cooked rice to keep the amount of energization to the body heater when the amount of cooked rice is large is small The rice cooker according to any one of claims 1 to 5, wherein energization to the drum heater is controlled to be larger than an energization amount to the drum heater.

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